There are 181 Fast Food Restaurants in St. Louis County, Missouri, serving a population of 999,539 people in an area of 508 square miles. There is 1 Fast Food Restaurant per 5,522 people, and 1 Fast Food Restaurant per 2 square miles.
In Missouri, St. Louis County is ranked 93rd of 115 counties in Fast Food Restaurants per capita, and 3rd of 115 counties in Fast Food Restaurants per square mile.